I can hello you can hello he can hello we can hello you can hello they can hello
V-ing form
I can be helloing you can be helloing he can be helloing we can be helloing you can be helloing they can be helloing
Perfect
I can have helloed you can have helloed he can have helloed we can have helloed you can have helloed they can have helloed
V-ing perfect
I can have been helloing you can have been helloing he can have been helloing we can have been helloing you can have been helloing they can have been helloing
Negation
Simple form
I can't hello you can't hello he can't hello we can't hello you can't hello they can't hello
V-ing form
I can't be helloing you can't be helloing he can't be helloing we can't be helloing you can't be helloing they can't be helloing
Perfect
I can't have helloed you can't have helloed he can't have helloed we can't have helloed you can't have helloed they can't have helloed
V-ing perfect
I can't have been helloing you can't have been helloing he can't have been helloing we can't have been helloing you can't have been helloing they can't have been helloing
Interrogative form
Simple form
can I hello? can you hello? can he hello? can we hello? can you hello? can they hello?
V-ing form
can I be helloing? can you be helloing? can he be helloing? can we be helloing? can you be helloing? can they be helloing?
Perfect
can I have helloed? can you have helloed? can he have helloed? can we have helloed? can you have helloed? can they have helloed?
V-ing perfect
can I have been helloing? can you have been helloing? can he have been helloing? can we have been helloing? can you have been helloing? can they have been helloing?
Interro-negative form
Simple form
can't I hello? can't you hello? can't he hello? can't we hello? can't you hello? can't they hello?
V-ing form
can't I be helloing? can't you be helloing? can't he be helloing? can't we be helloing? can't you be helloing? can't they be helloing?
Perfect
can't I have helloed? can't you have helloed? can't he have helloed? can't we have helloed? can't you have helloed? can't they have helloed?
V-ing perfect
can't I have been helloing? can't you have been helloing? can't he have been helloing? can't we have been helloing? can't you have been helloing? can't they have been helloing?